Automatic draft-regulator.



PATENTED MAR. 10, 1908.

H. J. WESTOVER. AUTOMATIG DRAFTBEGULATORQ.

4 BHEETB-8HEET 1.

APPLXOATION FILED JAN. 8, 1907.

1%. 881,272. PATENTEDMAR. 10, 1908.

4 H. J. WESTGVER. I

AUTOMATIC DRAFT REGULATOR.

APPLICATION FILE D JAN.8,1907.

4 SHEETS-SHEET 2.

PATENTED MAR. 10, 1908.

H. J. WESTOVER AUTQMATIG DRAFT REGULATOR. APPLIOATION FILED JAN. 8, 1907.

PATENTE'D MAR. 10, 1-968.

. H. J. WESTGVER.

AUTOMATIC DRAFT REGULATOR.

APPLICATION FILED JAN. 8, 1907.

Q SHBBTS-SHEET 4.

vwe nfiw for testing the condition of draft, all of of COL, in the gasesat all times. -Letters Patent #833,274, dated Oct. 16th,

I I ,appiaratus in question' of .CO present-at any givenjtime in the automatically the amount of draft by cor- :ffi if d l gd pmturcs from conditions wasted int is gases discharged through the proportion 01500., in the furnace gases.

vpa'ratus whereby the draft "is automatical y 'to take action accor permitting him tofa'ttend only from time to "time to check the rfperation'offthe machine. My invention is, therefore, analogous to the or NEW YORK, N. Y.

HEN RY J. WESTOVER,

AUTOMATIC DRAFT-REGULATOR.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed January 8, 1907. Serial No. 351,318.

To all whom, it may concern:

Be it known that I, HENRY J. VVESTOVER, acitizen of the United States, residing in the borough ofBromc,v city and State of New York, have invented a certain new and useful Improvement in Automatic Draft-Regulators,'-of which the following is a specification.

' For the purpose of burning coal economically under boilers and in other connections, it is recognized as hi hly desirable that the draft should be so rdlated to the consumption of coal that, while, on the one hand the oxygen supplied should be sufficient forcomplete com ustion, on the other hand an excess of draft should be avoided, in order that the heat )roduced may not be unduly chimney.

A variety of devices have been mvcnted which depend upon determination of the once of these are automatic in nature,pro vfdlng a continuous record of the pro ortion n my 1906, I have described and claimed an'improved'apparatus for this purpose, and I shall employ the apparatus therein shown as illustrative of certain parts of my present invention.

The former ty es 'of apparatus above ale luded to accomplish no more than the production of at record from which one may learn the condition of the'gases at any given time. The practically continuous presence and services of a skilled engineer are reguired, in order that such modification of raft may be effected as is appro riate at a given time to the condition revea ed by the y present inventionrelat'es to an a regulated in conformity with thejproportion furnace gases. This apparatus, dispenses withth'e cont nuous Cpresence ,of an engineer ing to-tha-CO, record;

governor on an engine,- sinceit regulates ef urnaoe gases.

I believe my invention to be basic in character and it is therefore to be understood that, while I have shown in my drawings but one form which the same may take, this form is to be looked upon as moral illustrativeof those which are covered y the spirit of my invention and the language of my claims.

The preferred form of my invention which I have chosen as illustrative thereof is shown in the accompanying drawings, wherein Figure 1 is a sectional view of my automatic circuit maker with the damper'mechanism in diagram; Fig. 2 is an enlarged sectional view of a part of the. same, Fi 3 is a diagrammatic view of the electricaly controlled damper, showing the same as combined with well known .-means for regulation of draft by steam ressure; Fig. 4 is a front 'view of the move le-electric bridge; Fig. 5

is a plan view of the bridge and magnetic circuit closer Fig. 6 .is side view of a modi fied form, Fig. 7 is a. sectional view of a portion of the circuitv closing floats showing, a

referred; Iron-frictional" centerin n1eans,

ig. 8 is a sectional view of a modified form. of circuit maker, Fig. 9 is a side viewof the automatic latch'mechanism, Fig. 10 is a sectional view of one end' of the total analysing apparatus, Fig. 11 is a, top view of the. 1

igs. 12, 13" and 14 are sectional views same, of the gas valve in different pbsitionsj, In my Letters Patent aforesaid,

ated. by electricity, the circuit be ng closed from time to time by-the mutual o eration of two concentric floats carried by t 'e' dis plac- 833,274, I. have shown a CO, recorder oper}.

ing liquid, the time of separation between the floats, and consequent 'breakin n of electric cireuit, being determined by t e degree of loss in volume of imprisoned-furnace due to abso tion in; an a p gpriate chamber. y certain parts,

with my'pre'sent invention. At the'same time certain parts so utilized have bel aimclaim these improved partshereiflf In the accompanying drawin the outer reservoir for thedisplacmg liqui is'shownlat -1. Within this, reservoir are. thecooperating floats 2 and 3. I ablysi uareo sulated angle. corners. 'Onl; ;one of these shown in Fig.

arly so andis guided by ins 4 at 'diagonally opposite section. The standards 4 carry rollers or Wheels 5 whereby the movement of the float I 2 is guided up and down with a minimum of friction.

.The chamber 6 may be called a supplemental chamber and communicates with the absorbing chamber 7 through the threeway valve 8. This latter chamber is a familiar feature in apparatus for gas analysis, being constructed inany well known manner to facilitate contact between the gases analyzed and the lye or other absorbing liquid used in a well known manner. The functions of these chambers and of the valve 8 are explained fully hereinafter.

The circuit whereby my a paratusis pri marily controlled is made y contact between the perforated and insulated metal plate 9 and the contact points 10 carried on a stem 11 dependin from the inner float 3 and passing throu h t e hole in saidplatefl. It is im ortant t at the inner float 3 should be care lly guided and centered in its movements relative to the outer float, and that these movements should be as little as possible obstructed'by friction. I therefore employ one or more sets of centering bars for this purpose, and I have illustrated the use of one of these sets in Figs. 1, 2 and 7. Here the depending stem 11 is grooved annularly as shown at 12 forming a narrow circular neck which affords a bearing for the centering. bars. These latter, preferably four in number consist of light pins or wires 13 pro vided at their inner or converging ends with thin'light sectors 14, which are supported within the groove 12 and bear li htl against the circular neck aforesaid as clear y shown in Fig. 7. The outer ends of the pins 13 abut against screws 15 whereby the centering of the float 3 maybe accurately adjusted. When the stem 11' is insuch a position that the. pins 13 are. in a horizontal plane, the inner edges of the sectors 14 fit against the cut out part of the stem fairly tightly. As the stem 11 rises or falls the sectors 14 follow it and maintain its central )osition practically without friction or ot ier resistance. Inasmuch as the up and down movement of the stem 11 is vcr slight-be'ing just enough to make or broa the electric circuits-the contact between 'the st'em and the sectors 14 1s never interrupted, and there will be no more than. a slig it change in the tightness of fit or horizontal pressure, which is accommodated by the elasticity of the material. The vertical motion ofthe float 3 with relation to the float2 is limited by the contact points 10 above the plate 9 and bythe in sulated lower stop 16, below said plate. The

' vertical'rnove-ment of the pins 13 will therefore be very smalland the depending stem will always be confined by the plates 14 toa central position.

As the controlling element of my device depends for a pro riate operation upon the breaking of t re e ectric circuit by relative movement of the two floats, means must be employed whereby current may be conveyed to the apparatus.

and to convey current to it and to the inner float through the standards 4 and Wheels 5, which are connected by a wire 17 to one pole of a battery or other generator 18. In the form shown this connection is made through the ener iaing coils of the magnet 19. The insulator plate 9, carried by the outer float is connected by the wire 20 to the second pole of the generator. So long as thecontact points 10 touch the plate 9 current will ass, and the magnet 19 will be energized.

he weight of the inner float 3 tends to preserve this contact, and the two floats will only move separately when the difference between the pressures in the main reservoir 1 and the supplemental chamber 6 is suflicient to cause the inner float to linger behind'the downwardly moving outer float.

Figs. 10 to 14 inclusive show enou h of the entire instrument in question to ilustrate F or this pur osc I prefer to make the outer float of thin ollow metal The reservoir 62 for the displacing liquid is carried by a vertical rack 63 and is connected a flexible tube 64 to the bottom of the disp acing chamber 1. The'reservoir is moved up and down by a pinion 65 engaging the rack 63 and impelled b a. pinion 66 and toothed sector 67. pivote at 68 and carr ing an arm 69 which is swun back,and fort by en agement as shownwith the cam groove 55.

higs. 12, 13 and 14 show one form of valve suitable to be used at 8. The pipe 70. connects with chamber 6, pi e 7l w1th atmospherc, pipe 72 brings the mace gasses, and )ipe 73'connects with the absorbing cham- 'er, 7. The position shown in Figs. 10 and 11 is that assumed by the apparatus when the reservoirs are desccndin the floats down. The valve is as shown in Fig. 12 and the residual gas in 7 passes from -73 to 70, being followed by the absorbing.

difference in pressure existing between the.

chambers 6 and 1. will overbalance the gravitative tendency of the inner float 3 which tends to preserve electric contact at the plate and the level. of the liquid in chamber 1 is ailing, carrying I 20 when the reservoir 62 is again raised by the floats be made to separateas the dis lacing ever the other shown in, lig. 3., Th

9,-and the circuit through the magnet 19 is broken. The action of the groove'55 and sector 67 continues to further depress the'reservoir 62 and lower the level of the liquid in 5 chamber 1 and then the groove 56 actsto place the valve 8 as in Fig. 13. The groove 55 at the. same time reverses the sector 67 and raises the reservoir 62 so that the liquid rising in ehaniber'l expels the gas through 1Q chamber 6, tube 70, and tube 71 to atmosphere. This continues untilaIl the gas is expelled through the valve 8. T hereupon groove 55 again reverses sector 67 and lowers reservoir 62, while groove 56 places valve 8 as in Fig. 14. The falling liquid then forms a vacuum which draws new furnace gas in from tube '72 to tube 70 and chamber 6.- This continues until a predetermined volume of 'mixed furnace gases has filled chamber 6,

sector 67 and the valve 8 resumes the position shown in Fig. 12. The furnace gases are thus driven by the rising liquid through'tube 70,

valve 8, and tube 73 into the absorbinchamber 7, driving the absorbing liquid ahead of it into reservoir 7 4. This causes absorption'of CO and the cycle of operation above described begins again.

My present invention is broad enough to cover any device wherein the controlling means for the motive device which moves the draft regulator is itself governed by the; differences in ressure due to absorption of ie ilustrative form of my invcn- C10 In tion herein-shown this is accom lished elec .ptrically, and preferably by the chewing or equivalentmeans. 5 i As shown in said former patent, at theme-,5

ment that the two floats separate and con},

tact broken, the main float 2 will occupy a certain position within the vessel 1 de ending upon the extent to. which the tota volume of gas acted upon'within the absorbing 4 chamber 7 has been diminished-by absorption of the CO contained therein. The greater the proportion of CO present in the fixed initial volume of gas, the less residual gas will there be and the sooner will the two liquid descends in the .chamber can vessel 1.. Consequently a high position the main float 2 when separation pt the flo'atsoccurs corresponds to ahigh p'ercentage of CO in the gas treated and the lower-.thi s'percentage, the lower will the float.;-2,.si before the two floats separate and-circuiti broke order to ,avail myself of this onditio cause proper automatic 'acti'onofthe" draft regulator I prefer or My the-following so .m'eans; Opposite tl'ie'poiesofth'egrnagnet l9 'Lplace afraine 2ljsnpporte'df-so as tomove easily, for ii'istance on rollers 22. 'At the outer end of the frame 21 thcreare carried pairs of contact but-tons 23 'placed. onc'pair spring 24, abutting at 25 tends to push the frame 21. away from the magnet, so as to close circuit across one or another pair of buttons 23, according as the electric bridge is placed opposite one or the other of sald pairs oi" contact points.

The electric bridge may take a variety of forms, and l have shown one in Figs. 1., 4 and 5 which is suitable to my invention. llerea metal plate 26 carries springs 27 placed opposite the'vertical lines of contact buttons 23. The plate .26 is carried upon an upright rod 28 which is in turn carried by the main float 2'. Thus the level of the bridge is always determined by that of the main float. I prefer to place a fixed support 29 with friction rollers 30 behind the plate 26, to take the thrust of the frame 21 when pressed outward by the spring 24. it will thus be seen that; when circuit is opened at ll) by separation of 'the floats, and the magnet 19 is deenergized, the frame 21 will at once move forward and thusclose circuit acrossone or the other pair of buttons 23. The position of the float 2 and bridge 26, 27, will be determined at that moment by, the percentage of.

,"in the; gas treated, and this position will turn -detcrmine which of the circuits hjthe buttons 23 will be closed.

Iiot essentialto my present invention t the operation of the main circuit closer d-depend upon theopening of circuit by part tion of thefloats or equivalent devices. I I -n1,' Fig.8 I haveshown a modified form of my invention wherein the magnet 19 acts positively to draw the frame 2l to the left to close circuit, while the springs 24 act to break. this main'cirouit when themagnet is zdfil'gind. This form of electro-inagnetic apparatus is combined, as shown with a rnodified form oh'cireuit controller on the floats. In thisfformfthe stem depending" from the float 3 carries insulation above instead of below the plate 9 and this normally rests lightly on said plate. 'lhe contactinaking points 10 are below the plate 9, and in consequence, when, on. the downward movement, the float 2 begins to leave the heat 3 behind, due to differences in pressures, the points 10 strike the plate 9, there by'closing circuit through the magnet 19 to cause closure of the main operatingcircuit. The operation. of the motor actuating the draft regulator will be governed by the selec tion of buttons 23 thus accomplished. A great variety of means for causing the circuits.so selected to regulate the draft might e constructed, all offwhieh are within my iif' in -the,illustrative form shown in Fig. 3,

necting wires lead to clectro magne-tic' coils on 42 is energized;

arranged -to control the draft regulator substantially as follower-The draft regulator,

in this form, consists of a swin ing damper 32 in the air flue 33, connectediy' the lever 34 and connecting rod 35 to the bell crank lever 36, one arm of which is slotted, as at 87 to take over a in 38 on the double solenoid core 39, 40.- he two enlarged ends of the core 39 and 40 are'respeetively acted upon by two series of separate solenoid coils wound on the insulating sleeves 41 and 42 as shown. In Fig. 3the dampcris in a middle position cotres ending to the middle ositionof the solenoi core. If the c0re;40 is acted u on todraw it to the right the damper wil be opened to a certain extent depending upon which of the solenoid coils lffonthe contrar the core 39 is drawn magnetically to the is t, the damper will be closed to an extent depend .ing upon which of the coils on 41 is energized. In the form shown the solenoid coil farthest to the right is energized when circuit is closed by thebridge across the top pair of buttons 23; thus causing the maximum 0 ening-of the damper when the percentage 0 CO 15 at a maximum in the furnace gases. The next two right hand solenoid coils. in order copespond t0 the next pair of buttons 23 and, as the core 40 will always. tend to bring its neutral magnetic axis under that of the coil or coils energized at any time, it follows that whenthe secondor third pair of buttons from the top is bridged, the solenoid core will move a corresponding dis- .tance to the left and partly close the damper.

The succeeding pairs of buttons lower down are connected to battery 31 through solenoid coils, progressively. further and further to the left and therefore tend more'and more to close the damper and diminish the draft. The arrangement of lcversshown is suehth at e ual movements ot the cores 39, 40 to the is t or right from-the middle position shown produce progressively smaller changes in the position of the damper, thus increasing the delicacy of regulation as extremes are reached. This is desirable for obvious reasons.

The distribution of coils upon one side or the other of the solenoid, the strength of each, their total number, etc. will dependupon the specific results looked for in each case. In t e form shown 111 Fig. 3, the C0,, regulator is combined with an automatic damper regulator controlled by steam prossure and the two outermost coils on the right hand solenoid are employed in this connection. At 43 is diagrammatically shownthe steam cylinder of a regulating device of any-well known type intended to act so as to illustration here.

the position of the CO, apparatus. may be accomplished in .a variety of ways of my complete invention.

increase the draft in case the steam pressure in the boiler falls below a minimum.

The steam in 43 normally supports the pivoted contact-making lever 4.4. When the pressure falls unduly, this lever descends and makes contact through a generator, as 45, across the terminals 46. 47'. This ener gizes the next to the last solenoid coil on the right and opens the damper. If the pres sure continues to fall, oircuit is closed across the terminals 48' and 49 and the extreme right hand solenoid coil acts to open the damper to its fullest extent. This details of construction of the steam actuated regulator form no part of this invention'and require no The may be of any type desired. 1 have mere y shown one way of combining my CO, regulator with a steam pressure regulator, this combination being within the scope of my invention.

As keeping up the steam pressure is usually of paramount 1m ortanee, the CO regulation being purely or coal economy, it is best that the coils controlled by the steam pressure should be atoll times capable, when ener ized, of over-powering the other coils, so that the air'nccessary for keeping up steam may always be available, whatever This known to those skilled in the art, either where a. common generator or separate generators are used for CO coils and steam coils respectively. In the form shown I accomplish this 1) Y USlIl a generator for the steam controlled code which is considerably more powerful than the generator 31 used for the CO, coils. i The result of combining the two forms or regulator as shown is that, if the steam pressure falls unduly the draft will be increased for producing increase of combustion irres s ectivc of economy. As soon, however, as t 1e steam resumes a proper predetermined pressure, the CO, coils take control of the damper and regulate combustioir or maximum economy.

In Fig. 6 1 have shown a modified form of bridging device for closing the primary controlling eircuit. Here the plate 26 is providcd with a contact face 50 sullicicntly extended in a vertical direction to close circuit through a number of pairs of buttons 23 at once. This will result in greater: certainty of action and will cause anumber of solenoid sections to act simultaneously, so that the solenoid core will respond to the resultant action of all.

In Fig. 9 l have shown in detail an improvomeut which preferably. forms a part In the apparatus shown in my former payint and so far described herein the floats riseand fall twice for each operation of the recording or regulating apparatus, as the dental. variations in pressure,

. tion of the pivoted latch or hook 52.

mg circuit should not be affected by separation of the .floats. By occurrence of accihowever, operative separation of the floats will possibly occur during the idle movement of the displacing liquid, and it is to prevent this that the construction shown in Fig. 9 is in tended. For this purpose it is desirable to prevent the two floats from risin with the iquid in the vessel 1 during its i le movement,that is to say, whenthe valve 8 is open to the atmosphere and the dead gases are about to be QJBCtECl. Many automatic attachments whereby this is accomplished by the appropriate movement of some part of the analyzing apparatus will occur to those skilled in the art and are within the scope of my broad inve'ntion.

In Fig. 9 I haveshown one illustrative means for this purpose wherein a cam 51 on the stem of the valve controls the p p plie hook 52, when in the position shown in the figure, engages'thetop of the bridging piece 26 in its lowermost position and pgevents the floats from rising. In this posltibn the contacts 27 are not opposite any of the but tons 23 and when the llquid moves the inner float upward with relation to the outer float, this movement cannot cause closure of the main operating circuit. The' tail of the latch. is held always in contact with the cam 51 by the spring 53. In the position shown the valve operating lever 54 is in position to open the vessel 6 to the atmosphere to permit ejection of gases. When said lever is turned to admit fresh and afterward to close access to the supply during absor tion, the cam 51, turning with it, turns t e latch 53 on its pivot and liberates the floats to permit their rising. The means above de scribed, while permitting independent relative movement of the two floats 2 and 3 when the displacing liquid is admitted, nevertheless prevent opcrative movement between Said floats.

My invention is broad enough tocovcr any automatic means for preventing operative relative movement of the floats during idle movement of the displacing liquid, whether such means act by arresting tho floats or. otherwise or whether operated directly by movements of the valve 8, or not. The utilization. of electricity is preferred in carrying out the principal operations sot 'lorth herein, although this is not essential to my broad invention. \Vhere electric cirsuits are used, however, they may be combined and arranged in many wayswithin my invention and the nature of the motive devices and mechanical features of the direct draft regulators may be indefinitely varied without departing from the scope. of this invention.

i In a variety of respects wide changes may be made in this device without de arting from the s irit of my invention and do not limit myse f to the details herein shown and described.

' What I claim is 1. A draft regulator, a plurality of independent prime movers. for operating the same, a source of stored up energy, means for storing furnace gas and absorbing CO therefrom and a device controlled by the residual gas for placing said source of energy in communication with one or another of said prime movers, substantially as described.

2. A boiler, a furnace and a draft regulator; in combination with two motive mechanismfor said regulator, means con trolled as to operation by variations in steam pressure for controlling one of said motive mechanisms and means operated by variations in percenta e of CO in the furnace gases for contro ling the second motive mechanism, substantially as described.

3. A draft regulator, a number of separately operative ,electroma netic prime movers therefor, etnd normall stationary mechanical meansfor transmitting motion from said prime inovers to said draft regulator; in combination with separate circuit closing elements connected respectively to said separately operative prime movers, means for storing furnace gas and absorbing CO therefrom and means controlled by the residual gas after absorption for selectingand closing circuit through one or another of said circuit closers for setting in operation one or another of said prime movers, substantially asv described.

4. A furnace, a draft regulator therefor,

regulator, a number of solenoid coils for said core, a multiple switch for said coils, a gasanalyzing apparatus adapted to receive gas from the furnace, and a connection between said analyzing apparatus and said switch for selectively operating the latter by the move- .ment of the former, substantially as described. '5. A boiler, a furnace and. a draft regulator, in combination with two sets of solenoid coils, a magnetic core controllable thereby and operatively connected to said draft regulator, means operated by variations in steam pressure for closing circuit through one of said sets of solenoid. coils and means controlled as to operation by varia tions in percentage of CO, in the furnace l a solenoid core operatively connected to said gases for closing circuit through the second set of solenoid coils, substantially as described.

6. A furnace, a draft regulator, an electro vmagnetic device for controll' the movement thereof to recelvc nctic device, a 'gas analyzing apparatusadapted to receive gas from the furnace having a valve for controlling the movement of gas in and out of the same, and means operatively connected with said valve for locking said. circuit changer so as to prevent its operation, substantially as described.

8. A. furnace, a draft regulator, an, electromagnetic controlling mechanism for the regulator, a group of contact buttons in circuit with said controlling mechanism and movably sup Jortcd, means for causing movement of the same, a gas analyzin apparatus adapted to receive gas from the -urnace and an independent movable contact maker moved by said as analyzing apparatus and ada )ted to ma to occasional contact with sai buttons, substantially as described.

EL A furnace, a draft regulator, an electro magnetic controlling meclnmism for the regulator, two indc 'mmlently movable contact makers arranged to close an, electric circuit for said controlling mechanism when brought together, a analyzing apparatus ada )tcd to receive gas from the furnace and mccl ically connected to one of said contact makers for moving it and means for moving theother of said contact makers, substantially as de scribed r 10; A furnace, a draft regulator, an elec tro-magnetic controlling mechanism for the regulator, two imlepluidently movable contact makers. arranged to close an electric circuit for said controlling mechanism wlien brought together, a as-analyzin apparatus ada ted to receive gas [10111 the furnace and mec ianically connected to one of said contact makers for moving it, an eloctro-magnetic device controlling movement of the other contact maker, and means operated by said analyzing apparatus for closing the cir cuit through said last named elcctrocnagnetic device, substantially as described.

11. A furnace, a draft regulator, elcctromagnetic controllm mechanlsm for the regulator, a number of pairs of circuit closing buttons in clrcult with said controlling mechlilllanism, a gas analyzing device adapted to receive gas from the furnace, and a bridging means placed opposite to said pairs of but tons and arranged to be moved by said gas analyzing device from one pair of buttons to another, substantially as described.

12. A furnace, a draft regulator, electromagnetic controlling mechanism for the regulator, a number of )airs of circuit closing buttons in circuit wit 1 the controlling mechanism and arranged to be movable together, electro-magne tic means controlling the movement thereof, a gas analyzing device adapted to receive gas from the furnace and controlling the electric circuit of said electro-ma-gnctic means, and a bridging means placed opposite said Jairs of buttons and arranged to be movedby said gas anal zing device from one air of buttons to anot er, substantially as t escribed.

13. A furnace, a draft regulator, eiec tromagnetic controlling mechanism for the regulator, a chamber, meansfor causing rise and fall of hqmd Within said chamber, two

floats carried by said liquid, a circuit closer operated by relative movement of said floats, a vessel adapted to receive gas from the furnace and arranged to determine the separation of said floats by the pressure of said gas upon said liquid, a movable bridging device operated by one of said floats, a

vmovable circuit closer opposite'the path of said bridging device and in circuit with said "cbntrollin r mechanism, an electro-magnet for contro ling n'iovement of said last named circuit closer and an electric circuit through said magnet and including the circuit closer on said floats, substantially as described.

\ 14. A furnace, a draft regulator, electromagnetic mechanism for controlling the same, a movable frame, a series of pairs of buttons thereon in circuit with said controlling niecluinism, an clectro magnet for mov ing said framein one direction and means for moving said frame in the opposite direction in combination With an automatic gas analyzer ada ted to receive gas from the furnace, at bringing device movable opposite said buttons and o erated by said gas ana lyzer and means a so operated by said gas analyzer for controlling the electro-magnet which. moves said buttons, substantially as described.

15. A furnace, a draft regulator, electromagnetic controlling mechanism for the regulator, a gas analyzing device adapted to receive gas from the furnace, comprising a chamber, means for causing rise and tell of liquid therein, a float carried on said liquid,

a contact making clement carried by said loo float, a second contact making element arranged to be moved toward and'awa from said first named element, a support ehind said first named element to resistthe thrust of said second element, electric connections by said gas analyzing device for causing op-.

erativc movements of said second element. substantially as described.

16. A furnace, a draft regulator, (l((,iI'()-, magnetic controlling mechanism for the regulator, a movable bride in; device. a support with rollers behind the same, a movable frame in front of said device, a number of pairs of contact buttons on said frame in circult with said controllinp mechanism, a gas analyzer adapted to receive gas from the furnace and means controlled thereby for moving said frame toward and away from said bridging device, substantiatll as de scribed.

17. A furnace, a draft regulator, electromagnetic controlling' mechanism for the regulator, a number of pairs ofcontact buttons movably supported together and in circuit with said controlling: mechanism, a movable bridging device opposite said buttons wide enough to touch more than one pair of buttons sinmltaneously, a gas anayzer adapted to receive gas from the furnace and operativelyconnected to said bridging device and means controlled by said gas ami-lyzer for moving said pairs of buttons, substantially described,

18. furnace, a draft re ulator, electromagnetic meiins for controlling the 11lovements of the regulator, a. displacing chamber adapted to receive gas from the furnace, a

float therein, a supplemental chamber, a sec- 0nd float'proje-cting into said supplemental chamber, circuit controlling means on said floats operated by relative movement thereof for controlling said elect-r0 magnetic means, means for causing recurrent rising of liquid in said displacing chamber and auto matic means for periodically preventing operative relative movement of said floats, substantially as described.

19. A furnace, a draft regulator, electromagnetic means for controlling the movement of the regulator, a chamber adapted to receive gas from the furnace, means for causing alternate rise and fall ofdiquid'in said chamber, a float within said chamber carried by said liquid, a second float also in said chamber and carried by said liquid, circuitcontrolling means on said floats operated by relative movement thereoffor controlling said electro-magnetic means and automatic means for periodically holding said floats out of operative position, substantially as described. r p

20, A furnace, a draft regulator, electromagnetic controlling mechanism for the regulator, a series of electric contacts in circult with said controlling! mechanism, a gas analyzer comprising a' chamber adapted to receive gas from the furnace, means for causing riseand fallof liquid therein, afloat carried on said liquid, an electric contact carried by said [loatsons to move opposite said first named contacts and -aulonnitic means for periodiealtr holding said movable contact out of the range of said first named contarts. substantially as desmibed.

31. A furnace, a draft regulator, electromagnetic eontrollinp mechanismfor the regre- I later. a series of electric eon tarts in circuit with said controlling mechanism, an electro-magnetie dericcfor controlling movement thereof, a displacing chamber adapted to receive from the furnace, floats therein, a circuit eontroller on said floats in circuitwith s'aid. eleetro magnetic device and automatic means for periodically preventing operation ofsarid circuit controller, substantial y as described.

rise and fall of liquid in said chamber, a valve controlling communication therewith, a float in said chamber, a rod onsaid float projecting from said chamber, a circuit controller for rod, a latch for engaging with 'saidrod and controlling mechanism controlled by said float, a latch for holding said float and a cam on said valve for operating said latch, sub- -stantial-ly as described.

25. vA furnace, a-drfift rcgulatorj i'notive means therefor, an rain circuit clo'ser governing said means and an'electi'o-magnet for holding ceive gas from the furnace and comprising a liquid within said chamber, two floats carried contact, whereby when said floats move in unison the main circuit. closer is inactive, but is operated when said floats have independsaid controlling mechanism operated by said means for operating said latch ope-ratively in said chamber, a circuit controller for-said chamber, means for causing rise and fall of;

by said liquid and carrying electric terminals 1n the e1 rcult of said magnet and normally in ceivc gas from the furnace, means for causing the circuit 0 en 'at'saidcircuit close-r in com; 7 blnation wit-1 a C0 analyzer adapted to reent movement, said analyzer also comprising, means for causing agas-d-is 'ilacing liquid to lift said lloas intermittently, substantially as described. 1

26. A furnace, a draft regulator, motive means therefor and a main circuit controller governing said means in combination with a C0 analyzer adapted to receive gas from the furnace and com prising a displacement chamber, means for causing rise and fall of liquid therein, two floats in said chamber and a mechanical connection between one of said floats and said circuit controller for operating the latter, substantially as described.

.27. A' furnace, a draft regulator andmotive mechanism therefor; in combination with means for storing gas from said furnace and absorbing (JO therefrom, a displacement chamber for producing movement of said gas, a float within said chamber, means for causing rise and fall of liquid in said chamber and means controlled by movement of said float for governin the operation of said draft regulator by said motive mechanism, substantially as described.

H. J. WESTQVER. Witnesses:

H. S. MAoKAYE, M. STEVEN. 

